# -*- coding:utf-8 -*-
class ListNode:
    def __init__(self, x):
        self.val = x
        self.next = None
class Solution:
    # 返回合并后列表
    def Merge(self, pHead1, pHead2):
        # write code here
        if not pHead1:
            return pHead2
        if not pHead2:
            return pHead1
        head = cur = ListNode(0)
        while pHead1 and pHead2:
            if pHead1.val < pHead2.val:
                cur.next = pHead1
                pHead1 = pHead1.next
            else:
                cur.next = pHead2
                pHead2 = pHead2.next
            cur = cur.next
        cur.next = pHead1 or pHead2
        return head


l1 = ListNode(1)
l1.next = ListNode(2)
l1.next.next = ListNode(4)

l2 = ListNode(1)
l2.next = ListNode(3)
l2.next.next = ListNode(4)

m = Solution()
s = m.Merge(l1,l2)
while s!=None:
    print(s.val)
    s=s.next